Re: [PATCH v2] serio: PS2 gpio bit banging driver for the serio bus

From: danilokrummrich
Date: Tue Aug 01 2017 - 00:18:13 EST

On 2017-08-01 01:34, Randy Dunlap wrote:
On 07/31/2017 03:35 PM, Danilo Krummrich wrote:

diff --git a/Documentation/gpio/drivers-on-gpio.txt b/Documentation/gpio/drivers-on-gpio.txt
index 3065132..b106e72 100644
--- a/Documentation/gpio/drivers-on-gpio.txt
+++ b/Documentation/gpio/drivers-on-gpio.txt
@@ -84,6 +84,11 @@ hardware descriptions such as device tree or ACPI:
NAND flash MTD subsystem and provides chip access and partition parsing like
any other NAND driving hardware.

+- ps2-gpio: drivers/input/serio/ps2-gpio.c is used to drive an PS2 serio bus,

drive a PS2
Is this PS2 as in IBM Micro Channel or PlayStation 2?

It's the PS/2 mouse/keyboard protocol introduced by IBM.
+ data and clock line, by bit banging two GPIO lines. It will appear as any
+ other serio bus to the system and makes it possible to connect drivers for
+ e.g. keyboards and other PS2 protocol based devices.
Apart from this there are special GPIO drivers in subsystems like MMC/SD to
read card detect and write protect GPIO lines, and in the TTY serial subsystem
to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO lines. The
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index c3d05b4..abca0e0 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -292,6 +292,16 @@ config SERIO_SUN4I_PS2
To compile this driver as a module, choose M here: the
module will be called sun4i-ps2.

+config SERIO_GPIO_PS2
+ tristate "GPIO PS/2 bit banging driver"

depends on GPIO

Thank you, missed that.
+ help
+ Say Y here if you want PS/2 bit banging support via GPIO.
+ To compile this driver as a module, choose M here: the
+ module will be called gpio-ps2.
+ If you are unsure, say N.
config USERIO
tristate "User space serio port driver support"